Assig-nob



Jan, 31, 1928. l

W. G. KRAUS PLUNGER Filed March 4. 1926 3286 Y m @Bbw Patented Jan. 31, 1928.

UNITED STATES renne PATENT OFFICE. l

WILLIAM G. KRAUS, OF BRILLION, 'WISCOli SIN, AESEG'NROF FRTY-NNE FER CENT TO ALBERT H. KRATLE, OID1 OSHKOSH, WISCONSIM.

JELUNGER.

Application ed March f1, 1926. Serial No. 952,318.

This invention appertains to irilunger-s or pistons susceptible -lor uae iter a nrunber et different purposes, such as pumps, engines and the like.

The primary object of the preseut inven tion is to provide an improved eniliiansible plunger to effectively take care ot wear.` an the `same occurs on the plunger packing and cylinder wallg so as to insure a proper iit at all times. i

A further object ot the invention is the provision of a novelpacking` tor the plunger and novel means Yfor compressing and holding the packing in place about the plunger body.

A still further object et the invention is to provide an improved plunger or piston of the above character, which will be durable and eiticient in use, one that will be simple and easy to manufacture and one which can be placed upon the market at a small cost.

W'ith these and other objects in view, tlie invention consists in the novel construction, arrangement and formation ot parts, as will be hereinafter more speeiiically described, claimed, and illustrated in the accompany ing drawings, in whichdrawingezf y Figure 1 is a side elevation otthe improved plunger,

Figure 2 is a longitudinal section through the same,

Figure 3 is an end view oli' the piangi-n.' body removed from the rod with the packing and one end disk removed troni the body.,

Figure 11 is an elevation oi one o'lt the end disks of the plunger, and

Figure 5 is a section taken on the lino 5-5 oii Figure 2 through the ljilunger and rod.

Referring to the drawings in detail. wherein similarreterence characters desir;w nate corresponding parts throughout the several views, the letter A generally indicates the improved plunger or piston and B the plunger rod.

The plunger rod includes the usual body portion 10 having one end thereoit 11 reduced in diameter to provide an annular stop shoulder 12. It preferred the reduced portion 11 oi the rod can be gradually tapered toward its tree end, and such end ie provided with external threads 13 im.' a purposc, which will be hereinafter more fully described. i

The improved plunger or piston 1li coin vprises an inner disk or plate 15, which is `zulapted to be slipped upon the redured por tien 11 o1 the rod B until the same rests against the shoulder 12. The inner tace ot the disk 15 is provided with radially entending grooves 16, which ae shown. are disposed at quarters. These grooves 1G lead into an annular recess 17, which is termed in the axial center o1 the disk, about the opening 18 lorined therein for receiving the plunger. in outer disk 19 is arranged alsoupon lthe reduced portion 11 et the plunger rod and is provided with a relatively large axial opening.;` or bore 2O for receivingl the said rod in order to permit the free sliding movement of 'the same on the rod and thie` disk` substantially of the same diameter as the disk 15. Arranged between the 15 and 19 is the plunger body 21 proper. which comprises an inner tapered expander element 22 having` an axial bore 25? lor the reception of the reduced portion oit the rod and this bore can likewise be tapered to con- 'l'orm to the configuration oi the said portion 11 of the rod. The other end oithe expander 22 is provided with an annular flange 2d: orresting against the disk 19. The outer expansible body oi? the plunger is preferably constructed from a. plurality oi independent enpansible sections each of which 'lorm a sectoriel' a circle and when the sections 26 are assembled, a substantial ly tapered bore 2T will be'i'ormed through the said exigianding body. its shown, there are :tour oit the 'sections 26 and at the inner end oit the expanding body, each section is provided with a lug 28, which slidably lits in one of the ways or grooves 1G termed within the dislr 15. shown the outer end ot the expansion body is provided with an inwardly directed relatively deep groove 30 and a contractile coil spring 31 fitted within the groove about the sectiona YFor normally holdingthe sections together and against the expander or mandrel 22.

Arranged about the expanding body 25 between the dislrs 15 and 19 is the packing 32 which can consist oit a plurality ol.1 rings 33. These ringe can be constructed ot aebeetos suitably treated witlri graphite and lili l lll) can be of an endless construction or a split construction. The disks l5 and 19V are of a greater diameter than the diameter ol the expanding body 25 so as to effectively hold the` ,packingy 32 theretbeneen.

Infassembling thej improved plunger,` the disk l5 is lirst placed on the plunger rod adjacent the shoulder 12, after which the expander 22's placed in the expanding,` body 25 and these pieces are then slipped into engagement with the disk with the lugs 28 in the groovev 1G atter whichthe packing' 32 is placed in position.. The disk 1S) is then placed on the body in engagement with the outer end oit the expander 22 and the outermost packingA ring. after which suitable ,nuts and 3am nuts Hare placed on the threaded. end 13 ofthe plunger rod and threaded into tight contact with the disk 19 forforcing 'the expander' into' the expanding body 25. vThis will gradually force lthe sections 26 of the expanding body 25 outward until the packing is inthe contact withthe wall ot 'Y the cylinder. As wearroecurs, it is merely CJ l necessary to givenutsjST/L a few turns,A so as to force the packing into tighter contact with the cylinder.

Fromthe foregoing description, it ean'be seen that I have provided a novel expanding .plunger of exceptionally simple and Adurable character, Whiclrwill eectively take care ofwvear and prevent injury to f the' wall of the cylinder,`

Changes inl details may be made vwithout 'departing from the spirit or the scope of this invention, but:

What I claim as new is: i l. A plunger comprising a rod,` including a reduced portion defining` a stop shoulder, a plunger body ttedi upon the reducedfportion of therod including an inner plate en gagging the stopV shoulder having` its inner maaar/s face provided with radially extemliing` ,guide grooves, an expander mandrel slidably mounted upon the reduced portion of the rod, an expanding` shell receiving' the mandrel including a plurality of radial movable sections, each section having a guide lug formed on its inner end slidably mounted within one of the guide grooves ot the disk, an outer disk engaging the expander mandrel, resilient means norn'ially holding` the sections ot the expanding: shell in engage ment with the mandrel, an adjustingy ineinber threaded upon the rod l'or engaging the outer disk and 'lfor moving; the disk and mandrel toward the opposite disk, and a plurality oit' packingl rings disposed upon the shell intermediate said disks.

2. A plunger ot the character described includinga rod having' one end reduced and setting up a stop shoulder, a disc body litted about said reduced portion and bearing against said shoulder, an expander-mandrel mounted upon said reduced portion, an expandinle shell receiving` said mandrel, and including-y a plurality of radiallj,7 movable sections bearing` at their inner ends against the adjacent face otl said disc, said expanding shell having' a deep groove formed .in the outer end thereof setting' up a relatively thin portion overlying said mandrel, a resilient element surrounding said thin portion of the shell and normally contractingthe sections thereof against the .mandrel` a disc member upon the outer end ot said reduced portion, means threaded upon the rod bearing against said outer disc lor forcing,l said? mandrel inwardly to expand the shell section, and a packing wrapped about said shell between said discs.

In testimony whereof atlix my si gnature.

VILLIAM G. KRAUS.

(ill 

